ELECTRIC PARKING BRAKE AUTOMATIC RELEASE FUNCTION DURING ACCELERATION MALFUNCTIONS [ELECTRIC PARKING BRAKE]

id040328250600

Outline

Description

•  The electric parking brake automatic release function at start malfunctions no matter any of the following conditions.

―  Door open/closed condition

•  The front door (driver’s side) is open.

―  Seat belt fastened

•  The driver’s side seat belt is unfastened.

―  Selector lever position

•  The selector lever is in the P or N position.

―  Accelerator pedal depression condition

•  The accelerator pedal is not depressed.

Possible cause

•  Electronically controlled brake unit malfunction

•  Front door latch and lock actuator (driver’s side) connector or terminal malfunction

•  Front door latch and lock actuator (driver’s side) malfunction

•  Open circuit in front door latch switch (driver’s side) ground circuit

•  Door-electrical supply unit (driver’s side) connector or terminal malfunction

•  Short to power supply in front door latch switch (driver’s side) signal circuit

•  Door-electrical supply unit (driver’s side) malfunction

•  Open circuit in front door latch switch (driver’s side) signal circuit

•  Connector C-70 connector or terminal malfunction

•  Driver’s side front buckle switch malfunction

•  Open circuit in front door latch switch (driver’s side) signal circuit

•  Dash-electrical supply unit connector or terminal malfunction

•  Short to power supply in driver’s side front buckle switch signal circuit

•  Dash-electrical supply unit malfunction

•  Open circuit in driver’s side front buckle switch signal circuit

Diagnostic Procedure

Step

Inspection

Results

Action

1

VERIFY SYSTEM DTCs

•  Switch the main power OFF.

•  Switch the main power ON (READY off or on) and wait for 10 s or more.

•  Perform a Quick Check using the M-MDS.
(See DTC INSPECTION.)

•  Are any DTCs displayed?

Yes

Repair the malfunctioning location according to the applicable DTC troubleshooting.

(See DTC TABLE [ELECTRONICALLY CONTROLLED BRAKE UNIT].)

No

Go to the next step.

2

VERIFY ELECTRIC PARKING BRAKE WARNING LIGHT ON CONDITION

•  Verify if the electric parking brake warning light is turned on.

•  Is the electric parking brake warning light turned on?

Yes

Perform an inspection referring to the [ELECTRIC PARKING BRAKE WARNING LIGHT TURNED ON] item.

(See ELECTRIC PARKING BRAKE WARNING LIGHT TURNS ON [ELECTRIC PARKING BRAKE].)

No

Go to the next step.

3

DETERMINE MALFUNCTIONING LOCATION BY PERFORMING PID/DATA MONITOR INSPECTION

•  Using the M-MDS, display the following PIDs for the door-electrical supply unit (driver’s side).
(See PID/DATA MONITOR INSPECTION.)

―  DOOR_SW_D (front door (driver’s side) open/closed condition)

•  Using the M-MDS, display the following PIDs for the dash-electrical supply unit.
(See PID/DATA MONITOR INSPECTION.)

―  S_BELT_STAT (driver’s seat belt fastened condition)

•  Does the PID value switch correctly in conjunction with the opening/closing of the front door (driver’s side) or with the driver’s seat belt fastened?

Yes

Replace the electronically controlled brake unit and perform the repair completion verification.

(See ELECTRONICALLY CONTROLLED BRAKE UNIT REMOVAL/INSTALLATION [L.H.D.].)

(See ELECTRONICALLY CONTROLLED BRAKE UNIT REMOVAL/INSTALLATION [R.H.D.].)

No

Not in conjunction with front door (driver’s side) open/close:

•  Go to the next step.

Not in conjunction with driver's seat belt fastened:

•  Go to Step 10.

4

INSPECT FRONT DOOR LATCH AND LOCK ACTUATOR (DRIVER’S SIDE) CONNECTOR FOR MALFUNCTION

•  Inspect the applicable connector and terminal.
(See CONNECTOR INSPECTION.)

•  Is the connector normal?

Yes

Go to the next step.

No

Repair or replace the malfunctioning location and perform the repair completion verification.

5

INSPECT FRONT DOOR LATCH SWITCH (DRIVER’S SIDE) FOR MALFUNCTION

•  Inspect the applicable part.
(See FRONT DOOR LATCH AND LOCK ACTUATOR INSPECTION.)

•  Is the front door latch switch (driver’s side) normal?

Yes

Go to the next step.

No

Replace the front door latch and lock actuator (driver’s side) and perform the repair completion verification.

(See FRONT DOOR LATCH AND LOCK ACTUATOR REMOVAL/INSTALLATION.)

6

INSPECT FRONT DOOR LATCH SWITCH (DRIVER’S SIDE) GROUND CIRCUIT FOR OPEN CIRCUIT

•  Inspect the applicable circuit for an open circuit.
(See CIRCUIT INSPECTION.)

•  Is the circuit normal?

Yes

Go to the next step.

No

Repair or replace the malfunctioning location and perform the repair completion verification.

7

INSPECT DOOR-ELECTRICAL SUPPLY UNIT (DRIVER’S SIDE) CONNECTOR FOR MALFUNCTION

•  Inspect the applicable connector and terminal.
(See CONNECTOR INSPECTION.)

•  Is the connector normal?

Yes

Go to the next step.

No

Repair or replace the malfunctioning location and perform the repair completion verification.

8

INSPECT FRONT DOOR LATCH SWITCH (DRIVER’S SIDE) SIGNAL CIRCUIT FOR SHORT TO POWER SUPPLY

•  Inspect the applicable circuit for a short to power supply.
(See CIRCUIT INSPECTION.)

•  Is the circuit normal?

Yes

Go to the next step.

No

Repair or replace the malfunctioning location and perform the repair completion verification.

9

INSPECT FRONT DOOR LATCH SWITCH (DRIVER’S SIDE) SIGNAL CIRCUIT FOR OPEN CIRCUIT

•  Inspect the applicable circuit for an open circuit.
(See CIRCUIT INSPECTION.)

•  Is the circuit normal?

Yes

Replace the door-electrical supply unit (driver’s side) and perform the repair completion verification.

(See DOOR-ELECTRICAL SUPPLY UNIT REMOVAL/INSTALLATION.)

No

Repair or replace the malfunctioning location and perform the repair completion verification.

10

INSPECT CONNECTOR C-70 CONNECTOR FOR MALFUNCTION

•  Inspect the applicable connector and terminal.
(See CONNECTOR INSPECTION.)

•  Is the connector normal?

Yes

Go to the next step.

No

Repair or replace the malfunctioning location and perform the repair completion verification.

11

INSPECT DRIVER’S SIDE FRONT BUCKLE SWITCH FOR MALFUNCTION

•  Inspect the applicable part.
(See BUCKLE SWITCH INSPECTION.)

•  Is the driver’s side front buckle switch normal?

Yes

Go to the next step.

No

Replace the driver’s side front buckle and perform the repair completion verification.

(See FRONT BUCKLE REMOVAL/INSTALLATION.)

12

INSPECT DRIVER’S SIDE FRONT BUCKLE SWITCH GROUND CIRCUIT FOR OPEN CIRCUIT

•  Inspect the applicable circuit for an open circuit.
(See CIRCUIT INSPECTION.)

•  Is the circuit normal?

Yes

Go to the next step.

No

Repair or replace the malfunctioning location and perform the repair completion verification.

13

INSPECT DASH-ELECTRICAL SUPPLY UNIT CONNECTOR FOR MALFUNCTION

•  Inspect the applicable connector and terminal.
(See CONNECTOR INSPECTION.)

•  Is the connector normal?

Yes

Go to the next step.

No

Repair or replace the malfunctioning location and perform the repair completion verification.

14

INSPECT DRIVER’S SIDE FRONT BUCKLE SWITCH SIGNAL CIRCUIT FOR SHORT TO POWER SUPPLY

•  Inspect the applicable circuit for a short to power supply.
(See CIRCUIT INSPECTION.)

•  Is the circuit normal?

Yes

Go to the next step.

No

Repair or replace the malfunctioning location and perform the repair completion verification.

15

INSPECT DRIVER’S SIDE FRONT BUCKLE SWITCH SIGNAL CIRCUIT FOR OPEN CIRCUIT

•  Inspect the applicable circuit for an open circuit.
(See CIRCUIT INSPECTION.)

•  Is the circuit normal?

Yes

Replace the dash-electrical supply unit and perform the repair completion verification.

(See DASH-ELECTRICAL SUPPLY UNIT REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER].)

No

Repair or replace the malfunctioning location and perform the repair completion verification.

Repair completion verification

VERIFY IF MALFUNCTION CAUSE IS CORRECTED

•  Install/connect the part removed/disconnected during the troubleshooting procedure.

•  Has the malfunction symptom been eliminated?

Yes

Complete the symptom troubleshooting.

Explain repair contents to customer.

No

Refer to the CAN (controller area network) malfunction diagnosis flow to inspect for a CAN communication error.

(See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [L.H.D. (E)].)

(See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [R.H.D.].)

If the CAN communication is normal, perform the diagnosis from Step 1.

Description	• The electric parking brake automatic release function at start malfunctions no matter any of the following conditions. ― Door open/closed condition • The front door (driver’s side) is open. ― Seat belt fastened • The driver’s side seat belt is unfastened. ― Selector lever position • The selector lever is in the P or N position. ― Accelerator pedal depression condition • The accelerator pedal is not depressed.
Possible cause	• Electronically controlled brake unit malfunction • Front door latch and lock actuator (driver’s side) connector or terminal malfunction • Front door latch and lock actuator (driver’s side) malfunction • Open circuit in front door latch switch (driver’s side) ground circuit • Door-electrical supply unit (driver’s side) connector or terminal malfunction • Short to power supply in front door latch switch (driver’s side) signal circuit • Door-electrical supply unit (driver’s side) malfunction • Open circuit in front door latch switch (driver’s side) signal circuit • Connector C-70 connector or terminal malfunction • Driver’s side front buckle switch malfunction • Open circuit in front door latch switch (driver’s side) signal circuit • Dash-electrical supply unit connector or terminal malfunction • Short to power supply in driver’s side front buckle switch signal circuit • Dash-electrical supply unit malfunction • Open circuit in driver’s side front buckle switch signal circuit

Step	Inspection	Results	Action
1	VERIFY SYSTEM DTCs • Switch the main power OFF. • Switch the main power ON (READY off or on) and wait for 10 s or more. • Perform a Quick Check using the M-MDS. (See DTC INSPECTION.) • Are any DTCs displayed?	Yes	Repair the malfunctioning location according to the applicable DTC troubleshooting. (See DTC TABLE [ELECTRONICALLY CONTROLLED BRAKE UNIT].)
1		No	Go to the next step.
2	VERIFY ELECTRIC PARKING BRAKE WARNING LIGHT ON CONDITION • Verify if the electric parking brake warning light is turned on. • Is the electric parking brake warning light turned on?	Yes	Perform an inspection referring to the [ELECTRIC PARKING BRAKE WARNING LIGHT TURNED ON] item. (See ELECTRIC PARKING BRAKE WARNING LIGHT TURNS ON [ELECTRIC PARKING BRAKE].)
2		No	Go to the next step.
3	DETERMINE MALFUNCTIONING LOCATION BY PERFORMING PID/DATA MONITOR INSPECTION • Using the M-MDS, display the following PIDs for the door-electrical supply unit (driver’s side). (See PID/DATA MONITOR INSPECTION.) ― DOOR_SW_D (front door (driver’s side) open/closed condition) • Using the M-MDS, display the following PIDs for the dash-electrical supply unit. (See PID/DATA MONITOR INSPECTION.) ― S_BELT_STAT (driver’s seat belt fastened condition) • Does the PID value switch correctly in conjunction with the opening/closing of the front door (driver’s side) or with the driver’s seat belt fastened?	Yes	Replace the electronically controlled brake unit and perform the repair completion verification. (See ELECTRONICALLY CONTROLLED BRAKE UNIT REMOVAL/INSTALLATION [L.H.D.].) (See ELECTRONICALLY CONTROLLED BRAKE UNIT REMOVAL/INSTALLATION [R.H.D.].)
3		No	Not in conjunction with front door (driver’s side) open/close: • Go to the next step. Not in conjunction with driver's seat belt fastened: • Go to Step 10.
4	INSPECT FRONT DOOR LATCH AND LOCK ACTUATOR (DRIVER’S SIDE) CONNECTOR FOR MALFUNCTION • Inspect the applicable connector and terminal. (See CONNECTOR INSPECTION.) • Is the connector normal?	Yes	Go to the next step.
4		No	Repair or replace the malfunctioning location and perform the repair completion verification.
5	INSPECT FRONT DOOR LATCH SWITCH (DRIVER’S SIDE) FOR MALFUNCTION • Inspect the applicable part. (See FRONT DOOR LATCH AND LOCK ACTUATOR INSPECTION.) • Is the front door latch switch (driver’s side) normal?	Yes	Go to the next step.
5		No	Replace the front door latch and lock actuator (driver’s side) and perform the repair completion verification. (See FRONT DOOR LATCH AND LOCK ACTUATOR REMOVAL/INSTALLATION.)
6	INSPECT FRONT DOOR LATCH SWITCH (DRIVER’S SIDE) GROUND CIRCUIT FOR OPEN CIRCUIT • Inspect the applicable circuit for an open circuit. (See CIRCUIT INSPECTION.) • Is the circuit normal?	Yes	Go to the next step.
6		No	Repair or replace the malfunctioning location and perform the repair completion verification.
7	INSPECT DOOR-ELECTRICAL SUPPLY UNIT (DRIVER’S SIDE) CONNECTOR FOR MALFUNCTION • Inspect the applicable connector and terminal. (See CONNECTOR INSPECTION.) • Is the connector normal?	Yes	Go to the next step.
7		No	Repair or replace the malfunctioning location and perform the repair completion verification.
8	INSPECT FRONT DOOR LATCH SWITCH (DRIVER’S SIDE) SIGNAL CIRCUIT FOR SHORT TO POWER SUPPLY • Inspect the applicable circuit for a short to power supply. (See CIRCUIT INSPECTION.) • Is the circuit normal?	Yes	Go to the next step.
8		No	Repair or replace the malfunctioning location and perform the repair completion verification.
9	INSPECT FRONT DOOR LATCH SWITCH (DRIVER’S SIDE) SIGNAL CIRCUIT FOR OPEN CIRCUIT • Inspect the applicable circuit for an open circuit. (See CIRCUIT INSPECTION.) • Is the circuit normal?	Yes	Replace the door-electrical supply unit (driver’s side) and perform the repair completion verification. (See DOOR-ELECTRICAL SUPPLY UNIT REMOVAL/INSTALLATION.)
9		No	Repair or replace the malfunctioning location and perform the repair completion verification.
10	INSPECT CONNECTOR C-70 CONNECTOR FOR MALFUNCTION • Inspect the applicable connector and terminal. (See CONNECTOR INSPECTION.) • Is the connector normal?	Yes	Go to the next step.
10		No	Repair or replace the malfunctioning location and perform the repair completion verification.
11	INSPECT DRIVER’S SIDE FRONT BUCKLE SWITCH FOR MALFUNCTION • Inspect the applicable part. (See BUCKLE SWITCH INSPECTION.) • Is the driver’s side front buckle switch normal?	Yes	Go to the next step.
11		No	Replace the driver’s side front buckle and perform the repair completion verification. (See FRONT BUCKLE REMOVAL/INSTALLATION.)
12	INSPECT DRIVER’S SIDE FRONT BUCKLE SWITCH GROUND CIRCUIT FOR OPEN CIRCUIT • Inspect the applicable circuit for an open circuit. (See CIRCUIT INSPECTION.) • Is the circuit normal?	Yes	Go to the next step.
12		No	Repair or replace the malfunctioning location and perform the repair completion verification.
13	INSPECT DASH-ELECTRICAL SUPPLY UNIT CONNECTOR FOR MALFUNCTION • Inspect the applicable connector and terminal. (See CONNECTOR INSPECTION.) • Is the connector normal?	Yes	Go to the next step.
13		No	Repair or replace the malfunctioning location and perform the repair completion verification.
14	INSPECT DRIVER’S SIDE FRONT BUCKLE SWITCH SIGNAL CIRCUIT FOR SHORT TO POWER SUPPLY • Inspect the applicable circuit for a short to power supply. (See CIRCUIT INSPECTION.) • Is the circuit normal?	Yes	Go to the next step.
14		No	Repair or replace the malfunctioning location and perform the repair completion verification.
15	INSPECT DRIVER’S SIDE FRONT BUCKLE SWITCH SIGNAL CIRCUIT FOR OPEN CIRCUIT • Inspect the applicable circuit for an open circuit. (See CIRCUIT INSPECTION.) • Is the circuit normal?	Yes	Replace the dash-electrical supply unit and perform the repair completion verification. (See DASH-ELECTRICAL SUPPLY UNIT REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER].)
15		No	Repair or replace the malfunctioning location and perform the repair completion verification.
Repair completion verification	VERIFY IF MALFUNCTION CAUSE IS CORRECTED • Install/connect the part removed/disconnected during the troubleshooting procedure. • Has the malfunction symptom been eliminated?	Yes	Complete the symptom troubleshooting. Explain repair contents to customer.
Repair completion verification		No	Refer to the CAN (controller area network) malfunction diagnosis flow to inspect for a CAN communication error. (See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [L.H.D. (E)].) (See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [R.H.D.].) If the CAN communication is normal, perform the diagnosis from Step 1.